linguisticexplorer/Linguistic-Explorer

class Example < ActiveRecord::Base
  include Groupable
  include CSVAttributes

  CSV_ATTRIBUTES = %w[ id name ling_id group_id creator_id ]
  def self.csv_attributes
    CSV_ATTRIBUTES
  end

  belongs_to :ling
  has_many :stored_values, :as => :storable, :dependent => :destroy
  has_many :examples_lings_properties, :dependent => :destroy
  has_many :lings_properties, :through => :examples_lings_properties

  validates_existence_of :ling, :allow_nil => true
  validate :group_association_match

  default_scope includes(:stored_values)
  scope :in_group, lambda { |group| where(:group => group) }

  def grouped_name
    (group ? group.example_name : "Example")
  end

  def group_association_match
    errors.add(:ling, "#{ling.grouped_name} must belong to the same group as this #{group.example_name}") if ling && (ling.group != group)
  end

  def storable_keys
    group.present? ? group.example_storable_keys : []
  end

  def store_value!(key_symbol_or_string, value_string)
    key = key_symbol_or_string.to_s
    if curr = stored_values.with_key(key).first
      curr.value = value_string
      curr.save
    else
      StoredValue.create(:key => key, :value => value_string, :storable => self)
    end
  end

  def stored_value(key_symbol_or_string)
    key = key_symbol_or_string.to_s
    if storable_keys.include? key
      (record = stored_values.select{|sv| sv.key == key}.first).present? ? record.value : ""
    else
      nil
    end
  end
end